Bihar Board Class 12 (Science) Sexual Reproduction in Flowering Plants — practice questions
103 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Bihar Board Class 12 (Science) Sexual Reproduction in Flowering Plants in the app →The female reproductive whorl of a flower is theA typical angiosperm embryo sac hasThe tough outer wall (exine) of pollen grains is made ofDouble fertilisation in angiosperms producesPollination of grasses occurs mainly throughSelf-incompatibility is a mechanism that preventsMicrosporogenesis (pollen formation) is initiated when:The mature embryo sac (female gametophyte) in flowering plants typically has:Pollination is best defined as the transfer of pollen from:Pollination by INSECTS is called:In a typical dicot embryo, the number of cotyledons is:In the fruit, the OVARY WALL develops into the:Parthenocarpy refers to:Which microsporangium wall layer lies directly beneath the epidermis?The outer three wall layers of a microsporangium mainly help inIn a young anther, the centre of each microsporangium is occupied byWhat is the usual diameter of angiosperm pollen grains?Pollen grains preserve well as fossils because their exine containsThe vegetative cell of a pollen grain hasWhich weed entered India as a contaminant of imported wheat and causes pollen allergy?Pollen of which families stays viable for months?A pistil with several carpels that are free from one another is calledWhich plant has a multicarpellary, syncarpous pistil?Which fruit develops from an ovary that has many ovules?The region where the body of the ovule fuses with the funicle is theEmbryo sac formation from a single functional megaspore is termedFree nuclear divisions in embryo sac formation mean thatGeitonogamy is genetically similar to autogamy becauseWind and water pollinated plants make excess pollen toWater pollination in flowering plants is limited to about how many genera?Which is a marine sea-grass that is pollinated by water?Water hyacinth and water lily are usually pollinated byPollen grains of most water-pollinated species avoid wetting by aWhich plant cannot complete its life cycle without a particular moth species?Monoecious plants such as castor and maize preventSelf-incompatibility blocks self-pollen byIn artificial hybridisation, emasculated flowers are usually covered with bags ofWhen the female parent bears unisexual flowers, the breeder can skipPollen germination can be watched on a slide using a drop ofTriple fusion in the embryo sac involves the fusion ofThe white kernel of a coconut isMost zygotes divide only after some endosperm forms, whichThe correct order of stages in dicot embryogeny isThe hypocotyl of a dicot embryo ends at its lower tip in theIn a grass embryo, the radicle and root cap are enclosed in theMature seeds typically contain about how much moisture by mass?In a seed, the micropyle persists as a pore that lets inWhich seed germinated after an estimated 10,000 years of dormancy?A 2000-year-old viable date palm seed was found near theApomixis is seen in some species ofWhich is the innermost wall layer of a microsporangium?How many microsporangia sit at the corners of a typical anther?Which substance forms the hard outer exine of a pollen grain?What is absent from the exine at the germ pores of a pollen grain?Which two substances make up the inner wall, the intine, of pollen?A mature pollen grain contains which two cells?Which weed that came with imported wheat causes pollen allergy in India?How long do rice and wheat pollen grains stay viable after release?In pollen banks, pollen is stored for years at -196 degrees C in what?Which part of the pistil acts as the landing platform for pollen?A gynoecium whose pistils are free from one another is called what?Which plant typically has a single ovule in its ovary?The junction between an ovule and its funicle is called what?The ovule opening left at the tip of the integuments is the what?What does meiosis of a megaspore mother cell produce?How many mitotic divisions turn a functional megaspore into 8 nuclei?Where are the two polar nuclei located in the embryo sac?What does the egg apparatus consist of?Which structure at the synergid tip guides the pollen tube?Where are the three antipodal cells of the embryo sac located?Pollen reaching the stigma of a different plant is called what?Pollen moving to another flower of the same plant is called what?Genetically, geitonogamy is most similar to which pollination type?What are cleistogamous flowers?Cleistogamous flowers guarantee what even without pollinators?Which plant bears both chasmogamous and cleistogamous flowers?Which pair of freshwater plants is pollinated by water?In a corn cob, the silky ears seen are actually which parts?What protects pollen of water-pollinated plants from wetting?Which animals are the dominant biotic pollinators of flowering plants?Which plant depends on a moth that lays eggs in its ovary locule?Which genetic mechanism stops self-pollen from fertilising ovules?Plants like castor and maize with both flower sexes on one plant are?Papaya has male and female flowers on different plants; this is called?What does continued self-pollination often result in?Out-of-step pollen release and stigma receptivity discourages what?A pollen tube emerges from the grain through which structure?Through which part of the ovule does the pollen tube enter it?Events from pollen landing until the tube enters the ovule are called?What sugar solution strength suits a pollen germination slide?Which phenomenon is unique to flowering plants among plant groups?Syngamy of a male gamete with the egg cell gives what?In a dicot embryo, which part lies above the cotyledons?What is the single cotyledon of a grass embryo called?Which sheath covers the radicle and root cap in grass embryos?What encloses the shoot apex and leaf primordia in a grass embryo?Which seed shows persistent nucellus remnants called perisperm?Which fruit develops without fertilisation, being parthenocarpic?A viable 2000-year-old seed near the Dead Sea belonged to which plant?Occurrence of more than one embryo in a seed is called what?Why can farmers reuse seeds of apomictic hybrid crops every year?Formation of microspores from a pollen mother cell is called what?Tapetal cells generally possess how many nuclei?